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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9e50733de71edba9b0cd27857f8eac728c5f612470c17d94fe8a512a0033d7' 
  AND token = 'UpF1nhH3T+Bn1YIoLx1Ugi+DOVQ2bIbrirjdkcT7DFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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