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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc264a75fbd389b1d4bfc6821330fb56d48973883c3dce38a8b638d23cbe468' 
  AND token = '5N6eBVJsBnMq53lJZDgwp8tulsH0VxLMrxnVjTSsjGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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