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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091e51c8b6142506d8bad868e1fe591ad7adb0c7ea3c159a75286c6f2bfb2288' 
  AND token = 'Lj6uodYAg3BHWVyg8Q5smrXg/KWydC9HdL+HMOSHq0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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