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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ee112173b27669cb15f91355a0356185d8069e2140020c1cbf8487b9f6d72b' 
  AND token = '2oA40JIR13nMIIlNjs90LBip0ojrNb7xz/bG/1pjyDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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