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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606cabfd9994193e0c129db6838a69208af023cb20d0c4af766729371cb066bf' 
  AND token = 'FxjFwD3SdMuveFYSPBz5apMOmjEo3AmtykL3GiTOxlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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