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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff8ef95ece4fb3a511a28a0ffd6a2db69c23207640e18c4e13c5e0fa1855274' 
  AND token = 'CGdywev7Usj+tOWqhd3PcxZxgXcJq6jBT58l0Ed26C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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