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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68de919e4f966898ba8b1efe37a82a61d7a84368a3854b45a980c9b53d95dbff' 
  AND token = 'jKBSQwJzKYisjwjGTDf4XmOsBA4arrYt3i8R4DmpUR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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