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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c795f8e9b8714566e2773c11303dac7e979a9e57fe14fd65c496ff15132832' 
  AND token = 'B9bX2Fa7Y3QN3xsS8xsePoD3BL3Yhf2DRHziid7xw7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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