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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbc02047750c6958d177508a38b136c515ea8617ee02b5df3b682adc9059d2f' 
  AND token = '8nIev1TjuAis1130H5So0rO65k78iQcZwyqNMq3xKJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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