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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2edae21f3ed55f3fdaa37b5076add1bdb359aa1ceaf0f78904be0d6b5e6c42' 
  AND token = 'LA5xjib7hw90YJtNKLIcLTTWWTaGzWumiFUoDLPnDDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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