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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcdf34f8ab340dcc60132709fc767b732b28feec0f5168c30ee1214e72bc2cc' 
  AND token = 'ubIz9+HCzOtEh+YQ16P7Ot64+5VJ0HIZBF2jRHy3VR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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