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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3246bbaaad87650c0ca95ad9e6456df885688e1ad3f46b9a6e2e87d15b2ce37a' 
  AND token = 'xn4P0Y2C6/V2roVLFOBa7HYIK/RMYqchc6+tSDny3CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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