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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc92b81cd6f3d9d85523cad98751d906b29bcdf3f55c0f5f1b36dd3e7b2b0e56' 
  AND token = 'YOwmovdTC/y2Vv1m/RKTlsXdSi7tlF1qm8GucX+vsKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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