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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640df1772438a630d7534c31b2658018d09851d72624e1185fe20481d73e0dfa' 
  AND token = 'Qn8836e4CyGdYxEQZn40kfQdwTgDOg+8u2k8X+LAYoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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