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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8718eaf1b43635ff47b2a0207a39763e77880bbd09e6aa2853b3013d66e4c5ea' 
  AND token = 'Td6ruuNKpml7bDypja9G6W9ZFyqalha8EW/s2jXlUVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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