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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d7d968394ea5ece6d1d0bf01b63543b42269bec0fb7a39ade76600c9ad6d99' 
  AND token = 'Bx8MbbXVjnIGNLhIiDkJnsSR3hDut1SbhMjq47x6XJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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