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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d74db0153c17118d1cf72752302f2a8758a9062bf5d87267db29a29d751469' 
  AND token = 'PpJCqAate1FtlvN3Aa9dIuYvp6NSz9ley0urFlZ+Dno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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