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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e03b547bc2cf389ea5a495481f25d3fedbd3b9d77337fe6a1dff6cda010fa8' 
  AND token = 'WZIsX4y3RMynO9UXEKOEhZ/Goi4rjuNIx98Lvy/dfOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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