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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd79c059d9b829c84044c723ee76d6ece5ec97c5e6fff2c7b40b25d220a7396f' 
  AND token = 'Cj1nJXaIraX+CusNfPiH4qOuxP3HCatiWEaeIn1UCpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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