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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562c6278f3a74941cf077a65c87e91a035287f8f4d63ffc98de806ee5b07a29a' 
  AND token = 'og/cD7F5W57oVsxvIOQZTG/OfjbTmt53V+Z1d0PmX5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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