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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f27311fffcbf1d88523fd039cd4f34e7b87497657722918d3b3112a1d8eab38' 
  AND token = '9qHt5h0WW3ZktJD4Alqvr2340fYkaSUUOuWGQQoXhXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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