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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900ff7a2ef3d8e0d39ca3c275b8c56d5a8ba0213f80910384cffd2d90124f830' 
  AND token = 'SkI7I2bof08T45YKui0QRgS0KlVli7VeI6HePxULP2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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