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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a074387d69d62989e8e9ed65db5163227c57ba294d4096e8f07df44ec4f9a2d9' 
  AND token = 'iknqItaMzgFBP/sLoK7I2HAH3IyE90KxITsbwIgrdXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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