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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e140bee285c2b2edf0a09940c3c025f151fc853a623ac7df22596110e024d56' 
  AND token = '4AcZ2xLTYpweeuaU2vIpvcIUzKOf8E0j7uAgP2fw6eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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