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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d08eaa61ea2f355d153879a50bd33ab0388207d36f9e548949ec012f94a238' 
  AND token = 'Mueycm7cvV77GQOyvYt9bqtBI72WZp8JNhKgZSEXAE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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