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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3b8f07d7a5c3798c2052cd51a7ea7fa886be7cc86230809a417172a342aa9c' 
  AND token = '5UsxhAkyXmWoht4K3c1OFTQodAwR5DmYKVzT6UgAOY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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