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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0910a3fcb7841921581373566bc00a0a18fc58426c1a038a65212a73bf7d07' 
  AND token = 'UnZYn9FIIjl8/N51l5Jos5kiyepWpX02huvd6BMofHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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