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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da6caca2f0a99bad0964d566577ae57435a62a07eb172d889cfaeacafdc3ad4' 
  AND token = 'T/deEkJffWvujN+C2i4Gl2Z9ikvztLzotP1mBIEjRog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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