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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a500b1a71063e81d5661734817ed6d8a6d20d6048a5e405a2a85d9741327bf8c' 
  AND token = 'ozZG6E7sRVAxZd31AxhCoJW/IabXjNgytiV81r0sBHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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