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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0b9ade71989e4eea2640487dcdc5723fde0b50ac4e22f24fabefce59d66da2' 
  AND token = 'gSY/eO8tTSaq+EFhAyG5KSCqprDavpQD7dH6aNLNF4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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