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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99113d1c169f616ca660a1dff114f6f4c3e3a4c65ab572de405f4114afe173c2' 
  AND token = 'DE6G8xHgXdwhGFiHxRTRT9DwkJavbbmGMmBia58OPEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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