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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767de24661ad5e91893f29b63848d51b6e0388d0702044405aa2d6b3f83f6a42' 
  AND token = 'uUT+wxqEMKX8n8FDTWGQ8TtRk469wLmaJat7bPxBCRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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