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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376232942e973772a629d4cd2831c771a05d59c2af48d92aeb088a427ff3156f' 
  AND token = 'o2ZQb12FYSPNBEkCD2MhjVCdq7EBmcNjx9/Cd2Jl17U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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