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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee4943738f5d68c95458adc5262697a9e366eb929ac26c48e565873e9f8a9d0' 
  AND token = '7ICFiwwVs5rTN5N+Q8B04KbWQuHhYZZ+H4hgIg7qlto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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