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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0334d9c3827d39096a1a0be45b3f432cfc46cd41c4a888f9ac076b98130fe4a4' 
  AND token = '9cOn8rKb7Kheys6g2vsVVXEE2D6LfSlO1zV7lC0GMoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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