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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32885466caaa0df8cfb0712815bf4379c7995a258ba10aa8421450b9514d3ce' 
  AND token = 'ICbGMqwVN5pIQ4l7rRTnG8xnH0Jar4R9hkt12N9EsXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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