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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074d054836b24fe93796f7de076b9e8b81289111ac1d0bf5297fabad71e37e0b' 
  AND token = 'LlDmN0C25hNq/+122yU773nmJG9tMRaA6UOxpVXASSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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