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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae01680b9e28f2d127b1f669cea57dfd05a5b00bcaea78a639b71e937e4f7b6e' 
  AND token = 'FpDnuSGV8F2vpdcs3t/p1Z7JbnKadJmzXz485WGew4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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