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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4c473f10e5e79b37e221bedbce5e8585dda03d8c02a033f441efd1f57760d0' 
  AND token = '0AmJAb0Sq0jJOr7yveSiLaexgJmVuNhPyuSr+Mlhvgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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