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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e4319b573e736127d7ea218ef7f7f88184f442fc2a0b6a1817d3369d207631' 
  AND token = 'XkfAWUijWJd2QgHXKoEZKGB4bAIhl6Bt6swDhOxNDsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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