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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529f05d629c39fe0ec58ff645aa3c0e5716796463dbe2314ce229216814b59d5' 
  AND token = 'lB8k+M+ffE2r4QlXnDUEceLpXxZk/4j0O/tb5sLhri8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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