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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c676ca5ff7665caf207d2754e04ffd284c4a076fbd63c39ffb50a6b031fbbe' 
  AND token = 'mHtE0bozt1n/EokweE5Jk0QiT09EEAOd9XO3GfY0Q28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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