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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0dd190a39a3a84462e492fab9072c838be299325f0da9b37810f3052edd88c' 
  AND token = '9g8sbafVtVJXn3UHEUxA2YA1BDbCD3GHdGm5yWTy7IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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