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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74c167dc1159f73938b2a1ed474f283d077dede00b9e17934fe2537f910b0de' 
  AND token = '+je0hDDAA9e9jC+65XA3/PnBzn0Y02O8HPcHxZwofnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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