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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036e011a1b43a32f84a598d0c66e279a3e441aaea3bed271d3d1aeb6609cff70' 
  AND token = 'KSHCAIoGOo2CgFVSblaW7klD96R6OPOWWXBI5PaeoKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}