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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0d702e1a756ef113e9bf4c58f49543e2d3cd8b593376d093af5a9def258ebd' 
  AND token = '2qFY4Jvrv20p74SnVET/JJ96lh4vCzR7GycpGyntVp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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