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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af07b430f475cd8e88134292531e6721ab7ae199ad6fc06594b89fc8c237fe39' 
  AND token = 'xyULHUylBbMe2JOL1M8L2/6Ni7/MCXDRfnz+6FJdMsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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