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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd8501cd0ed7c23ab94b161f048825452eacb9d7fe7bb0c1ddd64539dc68188' 
  AND token = 'fMsddSNdSP1OTI0131MsQhySEG9gfaoAR1P/YzMOX7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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