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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2246e5fa86efabdc5308909700abee072bc66be18bfaee182309a5baaa9192' 
  AND token = 'O4iOXK0YtSVOMiw05J7g2b3AQIXCRoph+pPNRC8s+f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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