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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a3da0f9afd45aaaa9bb4571818c9e7a96550ce84b6451c26ac7902e4909e4c' 
  AND token = 'jyi0q86nyiE0ZGRXlHWqvFHGunSUq6pcqu8CArq1sjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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