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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4695ee7dcf137a7a51751279d39d76a1d601319ccd572fe02ffdff3ccb08897e' 
  AND token = 'UqqLewUjNbZ2i24X6F5yEXSEYTNOHGDkVQ3oxAVaqk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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