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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f077aaddc924c293197ec7a4c05849c404f829167be6ea55de7c3136b84aeb3c' 
  AND token = 'iDpFmDQZPWKp5WUBYf82hKo7Owyux7gP2aZQ2PFbEVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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