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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3693d20e9a425eda0b21961a58b26c6fbfdea3117af2b2f2d6d2d9158bdd0d2' 
  AND token = 'wFK40NkcJzBahVyufqdy8rlCaoEfHPtxkps0dABGZfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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