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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c061cd518f46375f0ab5f69a1daed6e9d72e2968d71e6c4e5dd5add58b0ba9' 
  AND token = 'GNz+aEjRRe+0LaerO4Xh+a/bIC06kP/HuJ0xFgyIMHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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