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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a0196606dbc4c47ee3bec61ede5580c2519fe33e94104ae59d73f4fb0e2710' 
  AND token = 'mupFCx7a/s4LludvD9/Rq/M1uBit0kyf1IN2HS1gLyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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