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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837197387e04d87fb2fcee5d7c0dce2b09ac7c2fe19577b515a12122e3daef07' 
  AND token = '+c9SmeyEro8IHy4jg7xeDxZHjdxZ4ZGcb8yVS7Vh+IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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