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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b3e1ffa0af20b75ffd9288464450accce3131815869558daee78d80499c53c' 
  AND token = '7KomjwvzL8QxbCC//H7y5qtUZMIR+mcy1kIQHA9fUCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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