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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71a7a7521dcd6144398776629e9e68a314c767327c0841a996dd926e14ddf17' 
  AND token = '3D2Sbko+rYSLRI/nDvBHm/zu6tOsord1tTp3SXnITWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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