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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93276a7fffc65263a3fb0a99bfb90e8def3c5a04d1a8c42a61d4b9b4e6d3c2eb' 
  AND token = '04oKB5Dbp7l2sCQVgUM4uPBh2PI6PU71nL2cB7O2lb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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