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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8d05c6ce1b9575da4e04a77738f3b011e2125ed73effd7575f0aeee08cf175' 
  AND token = '0tdmN45IE4iQXij4/DxGyPLCDG1oZlCLQSjMPU2ey3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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