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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e580cee8ad5478e6ff9f3c5c86c00fe74469dc97379c37ed68a3aed61deba3' 
  AND token = 'Ic7cD7C8OmG93orOTkf5oN9Mi+OpU5aYXZ12g0s2TYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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